In respect to Smith Watkins,
Welcome to the Smith-Watkins website
I've never played a SW instrument but I have played 2 John Packers with SW designed leadpipes and they were fabulously in tune instruments (251 trumpet and 271 cornet) and both were under £500 Sterling.
I like a lot of what Dave Monette talks about but have yet to experience it (and when I do it will probably be the silver 6 mouthpiece due to cost) Then again I wonder if I really need to swap out my Wick 3C heavytop which works very well for me. I have asked a few questions of Monette and always got detailed and unsalesmanish answers.
That said I wonder if they are soooo much better than a Smith Watkins, a Harrelson, etc.
Like Seth I debate the idea of a perfectly in tune trumpet it is perhaps a grail quest I just think that in all the R and D and experimentation Dave Monette has come closer than most.